Adaptive FEC codeword management

Details Adaptive FEC codeword management Adaptive FEC codeword management

2008-08-04

2010-10-05

Ton, David (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error count or rate

C714S774000

Reexamination Certificate

active

07809996

ABSTRACT:
Adaptive FEC coding is used to adjust the codeword composition of FEC codewords in a communication system. A codeword composition ratio may be adjusted in response to variance of a measured transmission error value from a target transmission error value in the system. The codeword composition ratio may be any quantity or value that represents the relation between the payload and parity bytes in the applicable FEC coding scheme. Adjustment of the codeword composition ratio may be adjusting parameters such as the N, K and/or R values in ADSL1 systems or the INP and/or maximum interleaving delay values in ADSL2 systems. A controller may be used to monitor, analyze and adjust the various values used in adaptively managing FEC coding. The present invention may be implemented in a transmission system in which a transmitter transmits data to a receiver via a transmission channel, such as a DSL system.

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